Nuketown 2025 Bo2 Free. It's also available on an insert of every collector's edition. I heard that the nuketown 2025 (not the zombies map) map is now free apparently.

I heard that the nuketown 2025 (not the zombies map) map is now free apparently. By shooting all the mannequins heads off within two minutes of starting the game you can unlock an easter egg that changes the nuketown sign into a retro gaming system.